Deutsche Telekom has filed a lawsuit against Germany's Federal Network Agency protesting the preconditions for participating in a next-generation mobile network frequency auction, Germany's Die Welt newspaper said on Tuesday.

Germany stipulated that potential bidders must invest to expand the country's mobile network and permit roaming as a condition to take part in the 5G auction. Deutsche Telekom's suit claims the preconditions are too onerous, the paper said.

Copyright Reuters, 2019